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You broke the screen when you dropped it, that's why it looks that way. There's a glass layer under the screen that has cracked.
It doesn't happen from normal use. It's not a "wear issue" so there's no number of months/years where this occurs and there's nothing you need to worry about with regards to usage styles... other than don't drop it or impact the screen with another object.
I'm sorry that happened to you, but there's no applicable answer to most of your questions.
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